drm/amd/display: Pass errors from amdgpu_dm_init() up

Errors in amdgpu_dm_init() are silently ignored and dm_hw_init()
will succeed. However often these are fatal errors and it would
be better to pass them up.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -2594,8 +2594,12 @@ static int amdgpu_dm_smu_write_watermarks_table(struct amdgpu_device *adev)
 static int dm_hw_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	int r;
+
 	/* Create DAL display manager */
-	amdgpu_dm_init(adev);
+	r = amdgpu_dm_init(adev);
+	if (r)
+		return r;
 	amdgpu_dm_hpd_init(adev);
 
 	return 0;